E.164 dictates that phone numbers must start with the + prefix and country
code then followed directly by the mobile number leaving the local 0 prefix.

Warning

The caller is sent as through a best effort method and is not guaranteed to be shown on
the recipient’s mobile as it is and maybe replaced with an arbitary caller. This is dependent on the
policies of the carriers, intermerdiary networks and governments, and they may not honour your request.

Note

Notes on the recording_url parameter:

The mp3 file specified by the URL MUST be publicly accessible.

The URL can ONLY contain ascii letters or digits, underscores, slash or hyphens.

The Conference API when executed, will make a call to each of your participants
and connect them automatically to a conference call when they answer the call.
You can then simultaneously have a conversation with multiple people at
once on the phone.

To start a conference call, you can use the following API.
make a POST request to the endpoint: